Anything above 90%: > or equal to 90% is normal. This is related to the hemoglobin oxygen dissociation curve. There is a certain percentage of oxygen saturation before your cells will not let oxygen leave cell and go to tissue. That is somewhere around 88-92% so since the sensors are good only 90% + or - 2% points, we use 90%.
Answered 1/25/2021
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